UPD17217 datasheet(19/84 Pages) NEC

19 / 84 page

µPD17215, 17216, 17217, 17218

Table 2-2 Relations between Hardware Peripherals and Data Buffer

Peripheral Register Transferring Data with Data Buffer

Hardware

Peripherals

Name

Symbol

Peripheral

Data

PUT/GET

Address

Buffer

8-bit counter

TMC

05H

DBF0, DBF1

GET only

8-Bit Timer

8-bit modulo

TMM

06H

DBF0, DBF1

PUT only

NRZ low

PUT

level period

GET

setting

NRZLTMM

03H

DBF0, DBF1

Remote

modulo

Controller

Carrier

Generator

NRZ high

PUT (clear bit 3

level period

of DBF1 to 0)

setting

NRZHTMM

04H

DBF0, DBF1

GET (bits 3 of

modulo

DBF1 is always 0)

PUT (bits 0 to 3 of

AR3 and bit 3 of

Address

40H

DBF0-DBF3

AR2 are any)*

GET (bits 0 to 3 of

AR3 and bit 3 of

AR2 are always 0)*

*1: In the

µPD17216: bits 0 to 3 of AR3 are any, in the µPD17217, 17218: bits 1 to 3 of AR3 are any

2: In the

µPD17216: bits 0 to 3 of AR3 are always 0, in the µPD17217, 17218: bits 1 to 3 of AR3 are always 0

(2)

Table reference

A MOVT instruction reads constant data from a specified location of the program memory (ROM) and sets it

in the data buffer.

The function of the MOVT instruction is explained below.

MOVT DBF,@AR: Reads data from a program memory location pointed to by the address register (AR) and

sets it in the data buffer (DBF).

DBF 3

DBF 2

DBF 1

DBF 0

MOVT DBF, @ AR

b15

16 bits

Program memory (ROM)

Data buffer

UPD17217 Datasheet(PDF) 19 Page - NEC

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